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People walking along a white sand beach beside Kabira Bay's turquoise water, with boats anchored offshore, Ishigaki

Photo: Kabira Bay Ishigaki Island21bs5s4410.jpg by 663highland (CC BY 2.5, cropped), via Wikimedia Commons.

Ishigaki in April: weather, what to wear and what's on

In April, Ishigaki averages a high of 26.0°C (79°F) and a low of 21.3°C (70°F), with 146.9 mm of rain on about 8.8 days (JMA, 1991–2020).

Ishigaki weather in April

Averages for 1991–2020 at the JMA's Ishigakijima station (6 m above sea level).

High
26.0°C (79°F)
Low
21.3°C (70°F)
Precipitation
146.9 mm
Wet days
8.8 days
Sunshine
130 hours
  • Highs rise 2.3°C from March and climb another 2.7°C into May.
  • That is 1.2°C below Ishigaki's yearly average high of 27.2°C.
  • Of our 34 places with temperature records, Ishigaki is the warmest in April, 0.9°C warmer than Miyakojima.
  • April is Ishigaki's 6th driest month (146.9 mm).
  • Of our 35 places, Ishigaki has the 8th highest precipitation in April: 1.8 mm less than Miyakojima and 2.0 mm more than Kumamoto.
  • Rain of 1 mm or more falls on 8.8 days, and 10 mm or more on 3.5 days.
  • Rain of 30 mm or more in one day falls on 1.3 days, and 50 mm or more on 0.8 days.
  • On 1.3 nights the low stays at 25°C or above.
  • The sun is out for 40% or more of the possible hours on 12.8 days, and 4.6 days have under 0.1 hours of sunshine.
Average temperature
23.4°C (74°F)
Humidity
77%
Days of 25°C or more
21.6 days

Early, mid and late April

Ishigaki in April by ten-day period: averages for 1991–2020 (JMA)
DaysHighLowPrecipitation
1–10 April25.1°C20.3°C44.2 mm
11–20 April26.0°C21.2°C52.3 mm
21–30 April26.8°C22.3°C50.4 mm

By the last ten days of April the average high in Ishigaki is 1.7°C higher than in the first ten.

By ten-day totals, 11–20 April is the wettest (52.3 mm) and 1–10 April the driest (44.2 mm).

What to wear on Ishigaki in April

Warm: highs around 26.0°C

  • Short sleeves or thin long sleeves, with a light layer for air-conditioning and evenings.
  • Humidity averages 77%: quick-dry fabrics are more comfortable.
  • A folding umbrella: rain falls on 8.8 days.

Pack

  • Folding umbrella
  • Quick-dry clothes
  • A light layer for air-conditioning

Holidays and crowds in April

National holidays in April 2027:

  • Thu 29 April — Showa Day

In April 2025, hotels and inns across Okinawa Prefecture were 60.5% full on average (7th busiest of 12 months). Foreign guests spent 780,640 nights there that month (Japan Tourism Agency). That compares with 59.6% in March and 56.2% in May.

Frequently asked questions

What is the weather like on Ishigaki in April?

The average high is 26.0°C (79°F) and the average low 21.3°C (70°F). 146.9 mm of rain falls on about 8.8 days (JMA, 1991–2020).

What should I wear on Ishigaki in April?

Short sleeves or thin long sleeves, with a light layer for air-conditioning and evenings. Humidity averages 77%: quick-dry fabrics are more comfortable. A folding umbrella: rain falls on 8.8 days.

Is Ishigaki busy in April?

In April 2025, hotels and inns across Okinawa Prefecture were 60.5% full on average (7th busiest of 12 months). Foreign guests spent 780,640 nights there that month (Japan Tourism Agency).

What are the record temperatures for April on Ishigaki?

The highest temperature the JMA has recorded in Ishigaki in April is 31.4°C (89°F), on 23 April 2025. The lowest is 10.0°C (50°F), on 9 April 1943.

What events are on on Ishigaki in April?

Ishigaki Island Triathlon: Mid-April (18 April in 2027). Ishigaki Island SUP Grand Prix (9th): Late April (25 April in 2026).

April records on Ishigaki

The extremes the JMA has measured in April at its Ishigakijima station.

Hottest April day
31.4°C (89°F) on 23 April 2025 (records since 1897)
Coldest April night
10.0°C (50°F) on 9 April 1943 (records since 1897); also on 8 April 1909
Wettest April day
294.5 mm on 18 April 1984 (records since 1897)

What's on on Ishigaki in April

Events on Ishigaki in April: dates from each organizer's official page
EventWhenWhere and what
Ishigaki Island Triathlon石垣島トライアスロン大会Mid-April (18 April in 2027)Ishigaki City. A triathlon held in Ishigaki City. Official page
Ishigaki Island SUP Grand Prix (9th)石垣島SUPグランプリ大会Late April (25 April in 2026)Sokoji Beach, Kabira, Ishigaki City. A stand-up paddleboard (SUP) competition held at Sokoji Beach. 2027 date not yet published. Official page

Ishigaki before and after April

Ishigaki: March, April and May (JMA, 1991–2020)
MonthHighLowPrecipitationWet days
March23.7°C (−2.3°C)18.6°C (−2.7°C)134.4 mm (−12.5 mm)9.7 days (+0.9 days)
April26.0°C21.3°C146.9 mm8.8 days
May28.7°C (+2.7°C)23.9°C (+2.6°C)190.7 mm (+43.8 mm)9.2 days (+0.4 days)

Other places in April

April: Ishigaki against five other places (JMA, 1991–2020)
PlaceHighAgainst IshigakiWet daysAgainst Ishigaki
Miyakojima25.1°C−0.9°C9.9 days+1.1 days
OkinawaNaha24.3°C−1.7°C10.3 days+1.5 days
Yakushima21.4°C−4.6°C12.6 days+3.8 days
Kagoshima21.8°C−4.2°C9.9 days+1.1 days
Nagasaki19.9°C−6.1°C9.2 days+0.4 days

Read more

Sources for this page

  1. Normals for 1991–2020: Ishigakijima (石垣島), month by month (平年値 年・月ごとの値)Japan Meteorological Agency (JMA)
  2. Normals for 1991–2020: Ishigakijima (石垣島), rain days, temperature days and snow (詳細)Japan Meteorological Agency (JMA)
  3. Ten-day normals for 1991–2020: Ishigakijima (石垣島) (平年値 旬ごとの値)Japan Meteorological Agency (JMA)
  4. Records for April: Ishigakijima (石垣島) (観測史上1〜10位の値)Japan Meteorological Agency (JMA)
  5. National holidays (国民の祝日について)Cabinet Office
  6. Overnight Travel Statistics Survey, 2025 final figures (宿泊旅行統計調査 2025年 年の確定値)Japan Tourism Agency
  7. Ishigaki Island Triathlon (石垣島トライアスロン大会)Ishigaki Island Triathlon organizing committee
  8. Ishigaki Island SUP Grand Prix (9th) (石垣島SUPグランプリ大会)Okinawa Convention & Visitors Bureau (Okinawa Story)